title: Ictal magnetoencephalographic study in a patient with ring 20 syndrome.
mesh_terms: D000293:Adolescent; D002869:Chromosome Aberrations; D002890:Chromosomes, Human, Pair 20; D004827:Epilepsy / Q000503:physiopathology*; D005625:Frontal Lobe / Q000473:pathology; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D009030:Mosaicism; D013577:Syndrome